Setting of wire, or wire-rod, drawing plates or dies.



' M. HOWARTH. SETTING 0F WIRE, 0R WIRE ROD, DRAWING PLATES OR DIES. APPLICATION FILED OCT. 22.1918.

J52 are nfo 7 4 M. Howm 15 1 MARK HOWALR-TH, 0F PAIDGATE, ENGLAND.

SETTING OF WIRE, OR WIRE-ROD, DRAWING PLATES OR DIES.

To all whom it may concern:

Be it known that 1, MARK HOWARTH, a subject of the King of England, and resident of Padgate, in the county of Lancaster, England, have invented new and useful Improvements in and Connected With the Setting of Wire, or Wire-Rod, Drawing Plates or Dies, of which the following is a specification.

This invention has reference to the setting of wire or wire rod drawing plates or dies; and it has for its object and efiect to provide a method of setting the holes of the plates or dies which shall render the process less expensive,and at the same time simple, while the holes; formed shall be true, smooth, and have a uniform bearing surface.

Hitherto the setting of wire or rod draw plates or dies, have in some instances been effected by drilling the holes by machinery, especially in the case of smaller plates or dies, and in others by sizing the holes by rotary reamering them by machinery; and again, in other cases, the holes have been produced in the plates or dies by machine hammering, that is repeated blows of the punch or tool reciprocated by the machine on the holes, so that the hole is gradually hammered to the size required. Each of these mechanico-methods for setting plates however is defective or unsatisfactory, or has drawbacks; for instance, machines having rotary tools which cut or remove the metal,

have the draw-back that inasmuch as draw plates are very expensive articles, and resetting has to be repeatedly done at short intervals on account of the hole surfaces wearing, the life of the dies or plates would be short, and consequently the method would be extravagant and expensive especially in the case of plates for drawing the larger gages of wire; while as regards other processes or machines where the method of hammering or repeated stroke of the punch is adopted (which is nearly equivalent to the general present method of hand setting plates or dies), this is unsatisfactory, the punches break a good deal, and it does not give the character of holes desired, as regards true or uniform bearing surface, and in general it does not give the effects produced by the method of setting the holes of draw plates or dies according to this invention, which consists in effecting the setting by and in a single swaging or longitudinal pressing action of a tapered punch or tool,

. Specification of Letters Patent.

Patented Feb. a, 1919..

Application filed October 22, 1918. Serial No. 259,259.

actuated by machinery, and having a predeterminedor limited stroke. That is, by the single slow longitudinal swaging thrust of the punch or tool through the hole, while the plate is held in position, the operation of setting is complete, with the result that a smooth anduniform and true bearing'is provided, and the operation is more easily and rapid and correctly performed.

Further, according to the invention, the "mechanical setting operation is a continuous one, this being accomplished by a limiting or stop device being provided on or in connection with a punch spindle or carrier, by which after the adjustment of the device, the punch will be forced into the successive holes of the platesor dies to the same degree, and only to such degree, so that all the holes will be set to the same size auto-mechanically.

"A simple hand power machine for carrying out the method of setting drawing plates or dies according to this invention, is illustrated in the accompanying drawing.

This apparatus consists of a rigid frame a having an axially movable spindle 0 extending through transverse frame members 6, and supporting rigidly at its lower end by a chuck (Z, a tapered swaging setting punch e. The required vertical motion of the spindle is eifected by a thread on its upper part, which meshes with an internal thread in the hub 7 of the toothed operating wheel 7 which lies between, and is supported by, two of the transverse frame members b, and is rotated by hand through the bevel wheel 9 on the shaft h, which is revolved by the crank handle 71, and meshes with I.

The spindle 0 is prevented from turnin by having a square or flat upper end which passes through an opening of corresponding form in the upper frame member b.

Above the upper intermediate transverse frame member 7), there is a movable nut 02, which can be moved to and locked in any position on the threaded part of the spindle a, which serves as a limiting device or stop to the motion of the spindle.

In operating, the punch e is placed in the chuck d, and the plate 29 to be set is placed under the device Z on the base of the frame; whereupon the handle 2' is turned, and the punch thereby moved down into the hole of the plate,'and pressed in sufficiently to give the required size of hole, which is done by the tapered end of the punch; the nut n at this time being run up the spindle c.

When it has been ascertained that the punch has been moved or forced into the hole to the required extent to give the required size, and is in its lowermost position in the hole, the nut 71 is run down the spindle a so as to come on to the top surface of the upper intermediate transverse frame bar'b, and it is locked in this position by a pinching stud, or by other suitable known means. The machine having thus been adjusted to form or set holes in the plate or plates of the size required, subse quent holes of the same size can be rapidly made in the plate and other plates without trial and test, the size being controlled by the limiting of the descent of the punch by means of the stop device n.

After the first plate has been set, it is removed, and further plates inserted, and the holes set by turning the handle and moving the spindle ,0 up and down.

The punch being held firmly and straight in the chuck (Z, and pressed down by slow and constant pressure (instead of being loose and driven in by erks), the hole formed is true and smoother and more uniform than those generally made heretofore, and furnishes the advantages above referred to; and the punches are not so liable to be broken, as when the holes are set by hand.

While a hand power machine has been described of the screw type, the invention is no way restricted to same, and it may be carried out by any suitable difl'erent means.

What is claimed'is:-

A punch of the character described, comprising a base, a 'pair of vertical standards secured to the base, a pair of horizontal bars secured to the upper ends of the standards, a vertical punch rod having its upper portion screw-threaded and slidable in openings in the bars, a'horizontal bevel gear arranged between the pair of horizontal bars and contacting therewith to be held against VGllJlCfl-l movement thereby, said horizontal gear having a screw-threaded opening to receive the screw-threaded portion of the rod, a horizontal shaft secured toone standard, a

crank to turn the horizontal shaft, a vertical bevel gear rigidly secured to the h0rizontal shaft and engaging the horizontal bevel gear, a transverse bar secured to the top of the standards and having a vertical opening which is square in cross-section, an extension secured to the top punch rod and operating in the square opening, a stop nut engaging the screw-threaded portion of the punch rod and arranged above the upper horizontal bar to contact therewith, means to lock the nut to the rod, and a punch carried by the lower end of the punch rod.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARK HOWARTH. Witnesses:

WALT R S. BARKER,

THoMAs LEsLrs.

copies of this patent may be obtained for five cents each, by addressing the commiuioncz at Patenta. Washington, D. 0 

